Wrap optional params in options object

[jordanh]

There are a few global options I'd like to be able to add to all of the route generation functions. To avoid parameter length hell, the first step would be to change the call signatures of our methods slightly.

From:

export function createGetByIdRoute(routeBasename, acceptedKeys, getByIdPromise,
  modelKeyGetter = defModelKeyGetter,
  modelIdKey = defModelIdKey) { /* ... */ }

To:

export function createGetByIdRoute(routeBasename, acceptedKeys, getByIdPromise,
  options = defOptions) { /* ... */ }